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ursus · 07-15-2020, 08:39 AM

Note that the OP's modification is on a B engine which, unlike the Model A, has pressure to the mains. The B engine also has several 1/2 inch holes in the floor of the valve chamber so there isn't a pool of oil to drain down into the rear main after shutdown. Bob's modification appears to leave the rear main cap with a total of three exit ports as compared to the single drain tube in the stock configuration. With the slight pressure in the B engine, this would allow for a greater flow of oil to help cool the bearing, another advantage of this modification.

07-15-2020, 08:39 AM	#14
ursus Senior Member Join Date: May 2010 Location: Oregon Posts: 1,375	Re: Rear Main Bearing Drain Note that the OP's modification is on a B engine which, unlike the Model A, has pressure to the mains. The B engine also has several 1/2 inch holes in the floor of the valve chamber so there isn't a pool of oil to drain down into the rear main after shutdown. Bob's modification appears to leave the rear main cap with a total of three exit ports as compared to the single drain tube in the stock configuration. With the slight pressure in the B engine, this would allow for a greater flow of oil to help cool the bearing, another advantage of this modification.